Answer:
The correct answer is not listed in the provided options. The Emancipation Proclamation was important to the Union's strategy during the Civil War because it declared that all enslaved persons in Confederate-held territory were to be considered free, and it helped to undermine the Confederacy's economic and labor system by depriving it of its primary source of labor. Additionally, it changed the nature of the war by making it a war for freedom as well as a war to preserve the Union, and it encouraged enslaved persons in the South to flee to Union lines, where they could be used as laborers and soldiers.
Step-by-step explanation: